re: Officer Wilson's duty firearm, a Sig Sauer P229 .40 caliber, would not fire.

Correct. The slide was pushed back and out of battery. Thus no firing pin contact on the primer. No gun would have fired in this position. In fact, being the sig it actually saved his life by giving him the ability to pull the trigger in double action until the slide was forward and the round in battery.

Lot of tars up in this thread too.